Dictionaries will often show a phonetic transcription of words using phonemic script.
Example
The phrase 'please do it' can be transcribed as /pli:zdu:wit/ (without stress marks), showing an intrusive /w/ sound.
In the classroom
Phonemic script is a useful tool for many features of English pronunciation. Learners can be introduced to the phonemic alphabet systematically, and this knowledge can help them approximate pronunciation models, and use dictionaries. Dictionary use can show learners silent letters, weak forms, main word and sentence stresses, and features of connected speech, such as elision and intrusion, as in the example above.
See also:
https://www.teachingenglish.org.uk/article/phoneme
https://www.teachingenglish.org.uk/article/phonemic-symbols-1
https://www.teachingenglish.org.uk/article/phonology
Further links:
https://www.teachingenglish.org.uk/article/using-phonemic-chart-autonomous-learning
https://www.teachingenglish.org.uk/article/sound-spelling-correspondence
https://www.teachingenglish.org.uk/article/vocabulary-phonemic-revision-activity
https://www.teachingenglish.org.uk/article/phonetic-dominoes